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New dental Alloys with Special Consumer Properties

贵金属 2012年第A1期33卷 273-278页

作者： TYKOCHINSKIY d. S. VASEKIN V. V. OJSC "SIC 'Supermetal'" Moscow Russia

The purpose of the investigation was to create a new gold alloy of yellow for casting the frames of metal ceramic dentures. The yellow color corresponds to the consumer and aesthetic needs of some patients, because it is a sign of the metal, which is noble and innocuous. The main alloying elements of the majority of gold alloys for metal-ceramics are platinum and palladium, which increase the strength characteristics. Copper, tin, and other precious metals and base metals are also introduced in these alloys. At the same time, it is necessary to ensure the correspondence of the properties of the alloy with those of the ceramics applied onto the metal frame. For this purpose, the thermal expansion coefficient of the alloy (TEC) should be in a range of 13.5~14.5 ×10 6 K 1 when heated from 20 to 600 ℃ . The two-component alloys, alloying of gold with platinum and palladium results in a decrease in the TEC, and.the introduction of copper, silver, and tin, increases it. Multidirectional influence of the alloying elements is a factor in achieving compliance of the TEC with the given values of the alloy. In multicomponent systems, however, the mutual influence of individual components on the properties of the alloy is unpredictable. This also applies to the color characteristics of the alloys, which vary in the direction of reducing the yellowness with increasing concentration of platinum and palladium, while other elements may have the opposite effect on the results. Yellowness index (YI), calculated according to the results of spectrophotometric studies, has been chosen as an objective indicator of color. In this study, the requirement for YI was given not less than 25; the color of such alloys can be called light yellow. All the alloys investigated contained 85% (by weight) of gold. Therefore, higher corrosion resistance and biological inertness of a finished dental products were ensured. Among the alloys that met the yellowness/TEC requirements, two alloys have been sel

关键词： gold platinum palladium alloying elements alloy yellowness thermal expansion coefficient (TEC) metal-ceramics

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Amur tiger conservation education program:A pilot study on program effectiveness

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Integrative Zoology 2015年第4期10卷 403-407页

作者： Anna S.MUKHACHEVA Vasilissa V.dERUGINA Galina d.MAKSIMOVA Svetlana V.SOUTYRINA Sikhote-Alin Biosphere Zapovednik Primorskii KraiTerneiRussia Wildlife Conservation Society BronxNew YorkUSA Youth Creative Arts Center of Ternei Uragus Ecological ClubTerneiPrimorskii KraiRussia

Anthropogenic impacts are the primary threats to Amur tigers(Panthera tigris altaica)and.their *** living in proximity to tigers tend to view them negatively and,often,as a source of revenue on black *** aim to reduce human–tiger conflict by working with young students of Ternei County in the heart of tiger habitat in Primorskii Krai(Province).To inform and influence Ternei County’s future decision-makers,we developed“Safe Conduct”,a year-long education program held in 6 villages,culminating in a multi-school *** tested.the efficacy of Safe Conduct as a potential model for tiger conservation educational *** measured levels of student knowledge about tiger ecology,their attitude towards tigers,and.their willingness to engage in tiger conservation activites prior to,immediately after and 6 months following the completion of our *** supported.the fundamental premise of Safe Conduct that knowledge and attitude towards tigers are *** of tiger ecology and attitude towards tigers increased by the project’s completion;both remained high after 6 ***,commitment to participation in conservation efforts rose temporarily post-program and.then *** varied by *** recommend that the reasons for the high performance measures of students in 2 villages be investigated,and that lessons learned be applied to villages that *** Conduct represents a potential model for environmental education programs in Ternei County and elsewhere to educate future generations,to eventually develop a strong commitment to Amur tiger conservation at the community level.

关键词： Amur tiger behavior change conservation children education programs

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Quantifying relations between altered hydrology and fish community responses for streams in Minnesota

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Ecological Processes 2022年第1期11卷 536-560页

作者： Jeffrey R.Ziegeweid Gregory d.Johnson Aliesha L.Krall Kara Fitzpatrick Sara B.Levin U.S.Geological Survey California Water Science Center6000 J StPlacer HallSacramentoCA 85819USA U.S.Geological Survey Upper Midwest Water Science Center2280 Woodale DrMounds ViewMN 55112USA Minnesota Pollution Control Agency 520 Lafayette RdSt.PaulMN 55155USA Minnesota Pollution Control Agency 7678 College RoadSuite 105BaxterMN 56425USA

Background:Altered hydrology is a stressor on aquatic life,but quantitative relations between specific aspects of streamflow alteration and biological responses have not been developed on a statewide scale in *** sub-sets regression analysis was used to develop linear regression models that quantify relations among five categories of hydrologic metrics(i.e.,duration,frequency,magnitude,rate-of-change,and timing)computed from streamgage records and six categories of biological metrics(i.e.,composition,habitat,life history,reproductive,tolerance,trophic)computed from fish-community samples,as well as fish-based indices of biotic integrity(FIBI)scores and FIBI scores normalized to an impairment threshold of the corresponding stream class(FIBI_BCG4).Relations between hydrology and fish community responses were examined using three hydrologic datasets that represented periods of record,long-term changes,and short-term changes to flow regimes in streams of ***:Regression models demonstrated significant relations between hydrologic explanatory metrics and fish-based biological response metrics,and.the five regression models with the strongest linear relations explained over 70%of the variability in the biological metric using three hydrologic metrics as explanatory ***-based biological metrics demonstrated.the strongest linear relations to hydrologic *** most commonly used hydrologic metrics were related to bankfull flows and aspects of flow ***:Final regression models represent paired streamgage records and biological samples throughout the State of Minnesota and encompass differences in stream orders,hydrologic landscape units,and watershed *** methods can support evaluations of stream fish communities and facilitate targeted efforts to improve the health of fish *** also can be applied to locations outside of Minnesota with continuous streamgage data and fish-community sampl

关键词： EflowStats Best subset regression Altered hydrology Fish community Indices of biotic integrity Ecological flows

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An advanced cost-efficient IoT method for stroke rehabilitation using smart gloves

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Nanotechnology and Precision Engineering 2023年第4期6卷 40-54页

作者： A.Arivarasi d.Thiripurasundari A.Arockia Selvakumar Bhuvan Kumaar T.Aghil S.Rahul Ramani Kannan Vellore Institute of Technology ChennaiIndia Universiti Tecknologi Petronas Kuala LumpurMalaysia

Stroke represents a severe,widespread,and widely acknowledged health crisis on both national and international *** is one of the most prevalent life-threatening *** impressive advances in treating stroke,in addition to a need for effective patient care services,many sufferers still rely solely on physical *** present paper describes and explains the use of a newly designed gadget for stroke survivors who cannot move their *** is a sophisticated mobile device that enables stroke patients to regain their muscle memory and thus their ability to perform repetitive actions by continuing to tighten and stretch their muscles without the intervention of a *** methodology is used to encourage patients to become involved in the process of *** device also has sensors that take information and transmit it to an app through an ESP32 *** enables physicians to view glove usage information remotely and keep track of an individual patient’s *** between app and glove is facilitated by a broker in the Amazon Web Service *** the robotic glove presented here,the recovery rate is found to be 90.23%over four weeks’duration,which represents a significant improvement compared with existing hospital-based rehabilitation techniques.

关键词： Stroke rehabilitation Smart glove ESP32 AWS cloud

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development of mild and efficient method for synthesis of substituted flavones using oxalic acid catalyst

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Chinese Chemical Letters 2009年第2期20卷 171-174页

作者： Abhay S.Zambare Jaiprakash N.Sangshetti Nagnnath d.Kokare devanand B.Shinde department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University New drug discovery Wocckhardt Research Centre

Oxalic acid has been used as a catalyst for intramolecular cyclisation of 2-hydroxychalcones to form flavones in good yields. The efficiency of the catalyst was proved with a variety of substrates ranging from electro... 详细信息

关键词： Aromatic aldehydes 2-Hydroxychalcone Oxalic acid Flavones

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Multi-function device Based on Two Terahertz Optical Asymmetric demutiplexers

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Chinese Journal of Lasers 1999年第5期8卷 3-5页

作者： HONG Xiaobin LIN Jintong(Optical Communication R & d Center, Beijing University of Posts and Telecommunications, Beijing 100876, China) 北京邮电大学光通信R&d中心北京 100876 北京邮电大学光通信R&d中心北京

A multi-function device based on two terahertz optical asymmeric demultiplexers (TOAd) is proposed, which can be used simultancously as demultiplexing, data regeneration,clock recovery and wavelength conversion unit. The device can work at an ultra-high speed optical time-division multiplexing (OTdM) system with relativey low speed components.

关键词： OTdM clock recovery phase-lock loop (PLL) terahertz optical asymmetric demultiplexer (TOAd) data regeneration wavelength conversion

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disseminated intravascular coagulation after splenic artery aneurysm coils embolization:an unexpected surprise

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Gastroenterology Report 2023年第1期11卷 551-553页

作者： Marco Biolato Alessandro d’Errico Fiammetta Maria Rognoni Giuseppe Marrone Luca Laurenti Alessandro Cina Antonio Grieco department of Medical and Surgical Sciences Fondazione Policlinico Universitario Agostino Gemelli IRCCSRomeItaly Institute of Internal Medicine Catholic University of the Sacred HeartRomeItaly department of diagnostic imaging Radiation oncology and HematologyFondazione Policlinico Universitario Agostino Gemelli IRCCSRomeItaly Institute of Hematology Catholic University of the Sacred HeartRomeItaly Institute of Radiology Catholic University of the Sacred HeartRomeItaly

Introduction The Society for Vascular Surgery recommends treating nonruptured splenic artery aneurysms(SAAs)of>3 cm with a demonstrable increase in size or with associated symptoms[1].Percutaneous intervention with embolization coils or covered stents has become popular due to its high technical success rates and low morbidity[2,3].

关键词： Surgery artery coils

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Mass-forming pancreatitis: Value of contrast-enhanced ultrasonography

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World Journal of Gastroenterology 2006年第26期12卷 4181-4184页

作者： Mirko d'Onofrio Giulia Zamboni Alessia Tognolini Roberto Malagò Niccolò Faccioli Luca Frulloni Roberto Pozzi Mucelli department of Radiology University of Verona VeronaItaly department of Gastroenterology University of Verona VeronaItaly

AIM： To assess the utility of contrast-enhanced ultrasonography （CEUS） with a second-generation contrast medium in the differential diagnosis between mass-forming pancreatitis and pancreatic carcinoma. METHOdS： From our radio-pathology database, we retrieved all the patients affected by mass-forming pancreatitis or pancreatic carcinoma who underwent CEUS. We evaluated.the results of CEUS in the study of the 173 pancreatic masses considering the possibilities of a differential diagnosis between mass-forming pancreatitis and pancreatic tumor by identifying the ＂parenchymographic＂ enhancement during the dynamic phase of CEUS, which was considered diagnostic for mass-forming pancreatitis. RESULTS： At CEUS, 94% of the mass-forming pancreatitis showed intralesional parenchymography. CEUS allowed diagnosis of mass-forming pancreatitis with sensitivity of 88.6%, specificity of 97.8%, positive predictive value of 91.2%, negative predictive value of 97.1%, and overall accuracy of 96%. CEUS significantly increased.the diagnostic confidence in the differential diagnosis between mass-forming pancreatitis and pancreatic carcinoma, with receiver operating characteristic curve areas from 0.557 （P = 0.1608） for baseline US to 0.956 （P 〈 0.0001） for CEUS. CONCLUSION： CEUS allowed diagnosis of massforming pancreatitis with diagnostic accuracy of 96%. CEUS significantly increases the diagnostic confidence with respect to basal US in discerning mass-forming pancreatitis from pancreatic neoplasm.

关键词： Contrast-enhanced ultrasonography Pancreatitis Pancreatic neoplasm Mass-forming pancreatitis

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Continuous conversion of methanol to higher hydrocarbons at ambient pressure

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Journal of Natural Gas Chemistry 2010年第5期19卷 461-462页

作者： William W.Porterfield Gordon M.Zrelak L.Avery Moncure Matthew d.Huff Hampden-Sydney College Pennsylvania State University University Park UNC-Charlotte

An iodozincate ionic liquid solvent and catalyst is used to convert methanol continuously to a wide variety of hydrocarbons at atmospheric pressure.

关键词： methanol conversion zinc iodide hydrocarbon formation

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Geometry and dynamic Forces along an Inclined Hydraulic Jump over a Rough Channel Bed

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Journal of Civil Engineering and Architecture 2010年第11期4卷 26-32页

作者： d. dimitriou John d. demetriou Jd Research Hydrolab Athens 171 23 Greece

In this investigation, based on previous measurements, the geometry and dynamic forces along an inclined （angle φ, with 0^0 〈 qφ φ 8^0 ） hydraulic jump over a variation of rough and smooth channel beds, are examined and compared among them. The roughness is produced through transverse strips （of square cross section） covering the entire channel width and at various normal distributions along the channel. Froude numbers are varying up to 18.5 and conjugate depths＇ ratios up to 18.4. The water free surface profiles, the conjugate depths＇ ratios, the jumps＇ dimensionless lengths are examined and a prediction of exercised forces, in dimensionless terms, is also presented. The results and especially the latter force prediction may help the hydraulic and structural engineers when dealing with such hydraulic jumps.

关键词： Hydraulic jump rough beds.

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